Mounting for phonographic pick-up devices



Feb. 4, 1930. R. J. MARSHALL MOUNTING FOR PHONOGRAPHIC PICK-UP DEVICESFiled March 8, 1929 TOR N N H %/ZLM ATI'ORN Patented Feb. 4, 1930 UNITEDSTATES PATENT OFFICE ROBERT J. MARSHALL, OF ELMHURST, NEW YORK, ASSIGNORTO NORTH AMERICAN SOUND AND TALKING PICTURE EQUIPMENT CORPORATION, OFNEW YORK, N. Y., A

CORPORATION OF DELAWARE MOUNTING FOR PHONOGRAPHIC PICK-UP DEVICESApplication filed March 8, 1929. Serial No. 345,253.

The present invention relates to improvements in devices for recordingand reproducing sound for use in connection with apparatus for recordingand reproducing moving pictures. More particularly it relates to themounting of the pick-up recording device associated with the phonographrecord.

It is now common to provide a resilient connection between the turntablestandard and the base upon which the turntable is mounted, for thepurpose of insulating the standard against vibration from the drivingmotor and other sources of vibration which would have an adverse effecton the tonal quality of the sound reproduced or recorded.

In accordance with my present invention, I mount the pick-up orrecording device upon a standard attached to the turntable standardwhereby I avoid having either to rest the support for the pick-up deviceupon a member apart from the table bearing the turntable standard or toprovide separate insulating means between such standard and the maintable.

Myinvention will be clearly understood from the following detaileddescription taken with the annexed drawing, in which the figure shows anillustrative embodiment of my invention.

In said drawing, 10 denotes a table to which is attached a phonographicturntable 15 by means of bolts 12, 1 2, a plurality of felt washers 14being interposed between said standard and table as shown, such washersbeing effective to insulate the standard 11 from vibrations acquired bythe table 10 from the motor, not shown, for driving the turntable. Theturntable proper denoted by 15 on felt rings 28, 28 to receive which areprovided recesses 29, 29 in the worm-wheel 22. A collar 30 secured toshaft 27 by set screw 31 is provided at the top of the worm-wheel, saidcollar 30 and collar 24 being separated from the worm-wheel 22 by meansof felt washers 83, 84. In this manner a completely floatingconstruction is provided for the worm-wheel 22 which effectivelyprevents vibrations from said wheel from being transmitted to theturntable 15.

Attached to one leg of standard 11 is an arm 35, said arm being securedthereto by means of bolts 36, 36. Arm 35 has a platform 38 adapted toreceive the pick-up or recording device 39 which is operativelyassociated with the phonograph record 40, said device being joined tosaid platform as by a screw bolt 11.

It will be evident from the foregoing that I have provided a means formounting the pick-up or recording device such that said device iseffectively insulated from vibrations reaching same while making use ofno other vibration insulating devices other than those necessary to theinsulation'of the turntable shaft.

- I claim:

1. A device of the character described, a phonographic turntablecomprising a standard, a support for said standard, means attaching sameto said support, means for insulating said standard against vibrationfrom said support, a sound recording or reproduc ing device adapted tobe operatively associated with a record borne by said turntable, and astandard bearing said sound device attached to said turntable standard.

2. In a device of the character described, a phonographic turntablecomprising a standard, a support therefor, means for driving saidturntable, means attaching said turntable to said support, means forinsulating said standard against vibration from said support, means forinsulating said standard against vibration through said driving means,and a standard bearing said sound device attached to said standard ofsaid turntable.

3. In combination with a phonographic turntable comprising a standardand having means for insulating said turntable from vibration afiectinsound which is either recorded or repr said turntable, a sound recordingor reproducin device adapted to be operatively associate with a recordborne by said turn table, afiil a. standard bearing said" device whichis supported solely by said turntable standard.

In testimony whereof I have afiixed m I signature to this specification.

ROBERTJ. S

need in connection with

